We had plans of supporting actions directly with the packager repo (see https://github.com/BigWigsMods/packager/pull/44), but we hit some snags with the implementation (both actions and "packages") by GitHub. Don't know if that's been resolved or not now, feel free to test it.

It did throw an error when uploading a file to GitHub. Something about the file already existing, although I don't see the zip in my release assets
edit: must be just a mishap, it's working on my other projects